In just three years the personal trainer has revolutionised the way women exercise — all via Instagram.

Kayla, who was born in Adelaide, South Australia, has a social media following of more than 6million, launched a worldwide best-selling fitness app, Sweat with Kayla, and this month released her first healthy living book.

She founded her Bikini Body Guide together with her partner Tobi Pearce, 24 and they have since transformed the bodies and lives of 25million women.